{"nrhp_refnum":"88000802","name":"City Line Avenue Bridge","other_names":[],"category":"structure","location":{"address":"City Ave. over E branch of Indian Creek","address_restricted":false,"city":"Philadelphia","county":"Philadelphia","state":"PA","lat":39.985342392000064,"lon":-75.25870289999995,"geom_source":"nps_gis"},"listed_date":"1988-06-22","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering"],"significance_levels":["state"],"summary":{"what_it_is":"City Line Avenue Bridge is a 1913 solid barrel arch concrete highway bridge in Philadelphia, Pennsylvania, carrying City Line Avenue over Indian Creek. It is a single 20-foot main span with curving wing walls.","why_significant":"The nomination argues the bridge is a very fine example of an early, highly embellished urban concrete bridge. It is noted for ornamentation in both its configuration and detailing, and for a rusticated surface treatment meant to imitate stone. The arch rings are incised to represent voussoirs with a projecting keystone.","narrative":"Built in 1913 over Indian Creek in Philadelphia, City Line Avenue Bridge is a solid concrete barrel arch bridge with a single main span of about 20 feet. Its massive structure is approached on curving wing walls capped with balustraded parapets, and its solid concrete walls carry a simple rusticated surface meant to resemble stone. Many concrete bridges of the late nineteenth and early twentieth centuries received similar stone-imitating finishes, but few show this degree of ornament. Here the courses are articulated, and the arch rings are incised to suggest voussoirs with a projecting keystone. The bridge is an example of early urban concrete engineering, and its decorative treatment is the basis for its importance. The nominated area is a rectangle of about 80 by 68 feet, covering only the superstructure and substructure. The bridge is recorded as unaltered. It was entered in the National Register in 1988 as part of a group of Pennsylvania Department of Transportation highway bridges.","period_of_significance":null,"architect_builder":null,"architectural_style":null,"criteria":[],"status_note":"Unaltered, according to the integrity section of the form.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:37.711661-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/88000802.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/88000802/883129d734-800.webp","url_1600":"https://nationalhistoricalregister.com/media/88000802/883129d734-1600.webp","licence":"Public domain","author":"Smallbones","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:City_Line_Bridge_Philly.JPG\" rel=\"noopener\">Smallbones</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:City_Line_Bridge_Philly.JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71993791","wikipedia":"https://en.wikipedia.org/wiki/City_Line_Avenue_Bridge","wikidata":"https://www.wikidata.org/wiki/Q5123278"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/philadelphia/city-line-avenue-bridge-88000802/"}